CVE-2026-90222
UnknownSummary
In the Linux kernel, the NFC pn533 driver has a use-after-free bug. __pn533_send_async() publishes the command and then calls send_frame(), while the I2C threaded IRQ can concurrently complete the command and free the skb before the transport finishes using it.
Risk Assessment
A local attacker or hardware race can trigger use-after-free, causing a kernel crash (denial of service) or potentially arbitrary code execution in kernel context.
Recommendation
Update the Linux kernel to a version containing the fix that holds a temporary reference to the skb across the send_frame() call.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: nfc: pn533: hold a reference to the request skb during send_frame __pn533_send_async() publishes the command and then calls dev->phy_ops->send_frame(). Once dev->cmd is set, an incoming frame can be matched to this command: the I2C threaded IRQ runs pn533_recv_frame(), which queues cmd_complete_work, and pn533_send_async_complete() frees cmd->req with consume_skb(). On the I2C transport, pn533_i2c_send_frame() still dereferences the same skb after i2c_master_send() returns, so a completion that races the send can free the skb while the transport is still using it. The request skb is owned by the command object and may be freed by command completion at any time after dev->cmd is published, so the transport send path must not assume it stays alive. Hold a temporary reference to the request skb across the send_frame() call so the transport always sees a live skb even if completion races the send. Add a pn533_send_cmd_frame() helper and use it from all three send paths.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS